4D STEM: high efficiency phase contrast imaging using a fast pixelated detector

Yang, H., Jones, L., Ryll, H., Simson, M., Soltau, H., Kondo, Y., Sagawa, R., Banba, H., MacLaren, I. and Nellist, P. D. (2015) 4D STEM: high efficiency phase contrast imaging using a fast pixelated detector. Journal of Physics: Conference Series, 644, 012032. (doi:10.1088/1742-6596/644/1/012032)

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Abstract

Phase contrast imaging is widely used for imaging beam sensitive and weak phase objects in electron microscopy. In this work we demonstrate the achievement of high efficient phase contrast imaging in STEM using the pnCCD, a fast direct electron pixelated detector, which records the diffraction patterns at every probe position with a speed of 1000 to 4000 frames per second, forming a 4D STEM dataset simultaneously with the incoherent Z-contrast imaging. Ptychographic phase reconstruction has been applied and the obtained complex transmission function reveals the phase of the specimen. The results using GaN and Ti, Nd- doped BiFeO3 show that this imaging mode is especially powerful for imaging light elements in the presence of much heavier elements.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:MacLaren, Dr Ian
Authors: Yang, H., Jones, L., Ryll, H., Simson, M., Soltau, H., Kondo, Y., Sagawa, R., Banba, H., MacLaren, I., and Nellist, P. D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics: Conference Series
Publisher:Institute of Physics Publishing Ltd.
ISSN:1742-6588
ISSN (Online):1742-6596
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Journal of Physics: Conference Series 644(1):012032
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
655181Fast Pixel Detectors: a paradigm shift in STEM imagingIan MaclarenEngineering & Physical Sciences Research Council (EPSRC)EP/M009963/1S&E P&A - PHYSICS & ASTRONOMY